Numerical analysis of suction embedded plate anchors in structured clay |
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| Institution: | 1. Newcastle University, School of Civil Engineering and Geosciences, Newcastle upon Tyne NE1 7RU, UK;2. Universitat Politècnica de Catalunya, BarcelonaTech, Campus Norte UPC, 08034 Barcelona, Spain;1. College of Hydro Science and Engineering, Taiyuan University of Technology, 79 Yingzexi Rd, Taiyuan, 030024, China;2. Centre for Offshore Foundation Systems (COFS), Oceans Graduate School, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia;3. School of Engineering, RMIT University, Melbourne, Australia;4. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, 2 Linggong Rd, Ganjingzi District, Dalian, 116024, China;5. School of Civil, Environmental and Mining Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia;1. Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 205 N. Mathews Avenue, Urbana, IL 61801, United States;2. Mott MacDonald, 10 South LaSalle Street Suite 2520 Chicago, IL 60603, United States;3. Department of Civil, Construction and Environmental Engineering, Iowa State University, 406 Town Engineering Building, 813 Bissell Road, Ames, IA 50011-1066, United States;4. TDI-Brooks International Inc, United States;5. Infrastructure Geotechnics, University of Southampton, Southampton Boldrewood Innovation Campus, Burgess Road, Southampton SO16 7QF, United Kingdom;6. Arup, Level 4, 108 Wickham Street, Fortitude Valley, QLD 4006, Australia;1. School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Centre for Offshore Research and Engineering, National University of Singapore, 1 Engineering Drive 2, E1A-02-19, Singapore 117576, Singapore |
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| Abstract: | As offshore energy developments move towards deeper water, moored floating production facilities are increasingly preferred to fixed structures. Anchoring systems are therefore of great interest to engineers working on deep water developments. Suction embedded plate anchors (SEPLAs) are rapidly becoming a popular solution, possessing a more accurate and predictable installation process compared to traditional alternatives. In this paper, finite element analysis has been conducted to evaluate the ultimate pullout capacity of SEPLAs in a range of post-keying configurations. Previous numerical studies of anchor pullout capacity have generally treated the soil as an elastic-perfectly plastic medium. However, the mechanical behaviour of natural clays is affected by inter-particle bonding, or structure, which cannot be accounted for using simple elasto-plastic models. Here, an advanced constitutive model formulated within the kinematic hardening framework is used to accurately predict the degradation of structure as an anchor embedded in a natural soft clay deposit is loaded to its pullout capacity. In comparison with an idealised, non-softening clay, the degradation of clay structure due to plastic strains in the soil mass results in a lower pullout capacity factor, a quantity commonly used in design, and a more complex load–displacement relationship. It can be concluded that clay structure has an important effect on the pullout behaviour of plate anchors. |
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| Keywords: | Offshore geotechnics Anchors Structured clays Finite element analysis |
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